EP0900854A1 - Kondensatauffanganordnung für Schmelzbehandlung in Kaltherdofen - Google Patents

Kondensatauffanganordnung für Schmelzbehandlung in Kaltherdofen Download PDF

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Publication number
EP0900854A1
EP0900854A1 EP98202473A EP98202473A EP0900854A1 EP 0900854 A1 EP0900854 A1 EP 0900854A1 EP 98202473 A EP98202473 A EP 98202473A EP 98202473 A EP98202473 A EP 98202473A EP 0900854 A1 EP0900854 A1 EP 0900854A1
Authority
EP
European Patent Office
Prior art keywords
hearth
condensate
refining
retention
alloy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98202473A
Other languages
English (en)
French (fr)
Other versions
EP0900854B1 (de
Inventor
Stephen Martin Tilmont
William Frane Brinton
Leonard Earl Mcmullen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Titanium Hearth Technologies Inc
Original Assignee
Titanium Hearth Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Titanium Hearth Technologies Inc filed Critical Titanium Hearth Technologies Inc
Publication of EP0900854A1 publication Critical patent/EP0900854A1/de
Application granted granted Critical
Publication of EP0900854B1 publication Critical patent/EP0900854B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/22—Remelting metals with heating by wave energy or particle radiation
    • C22B9/228—Remelting metals with heating by wave energy or particle radiation by particle radiation, e.g. electron beams
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B34/00—Obtaining refractory metals
    • C22B34/10—Obtaining titanium, zirconium or hafnium
    • C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
    • C22B34/1295—Refining, melting, remelting, working up of titanium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/02—Crowns; Roofs
    • F27D1/025—Roofs supported around their periphery, e.g. arched roofs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements

Definitions

  • This invention relates to arrangements for collecting and retaining condensates of metal vapors generated during cold hearth refining of metal alloys.
  • an energy source such as an electron beam gun, directs energy toward an alloy to be refined which is contained in a water cooled hearth.
  • Typical refining arrangements for such alloys are described, for example, in United States Patents Nos. 5,171,357 and 5,222,547.
  • the alloys being refined such as, for example, various titanium alloys, contain elements with higher vapor pressures and/or lower melting points than other elements in the alloy and therefore evaporate preferentially to the other elements.
  • the metals evaporated during the refining process are typically collected on a condensate screen as described, for example in United States Patent No. 3,690,635.
  • the condensate normally has a different composition than the alloy being refined and, to provide the desired alloy composition after refining allowance is usually made in the feed material for the loss of constituents to the condensate.
  • the variability in the composition of the refined alloy often requires a vacuum arc remelting step resulting from loss of constituents to a condensate in order to meet chemical uniformity requirements. If the condensate variations during the original refining are of sufficient severity, the alloy may not meet the specification even after vacuum arc remelting, which can result in significant yield losses, additional processing costs and late deliveries.
  • Another object of the invention is to provide a condensate retention arrangement for cold hearth refining by which metal alloy constituents vaporized during refining can be effectively retained without causing contamination of the refined alloy.
  • a water-cooled condensate retention surface above the hearth in a cold hearth refining furnace to collect condensate in a form which is less brittle and less likely to break away and fall into the metal being refined.
  • the ceiling of the furnace is water-cooled and has a domed structure so that condensate collected on the ceiling has a "hoop strength" tending to hold the condensate against the dome-shaped surface.
  • a separate water-cooled member spaced from the ceiling of the furnace is provided.
  • the water-cooled member may have a surface which is formed with dovetail retention grooves to enhance retention of condensate.
  • a cold hearth refining furnace 10 includes a conventional cold hearth 12 which contains metal alloys to be refined and which is cooled in the usual manner by internal circulation of a coolant such as water. Energy is applied to the metal alloy to be refined from one or more energy sources such as electron beam guns 14 by which beams 15 of energy can be selectively directed toward the alloy material in the hearth. After refining the molten alloy is conveyed through a trough 16 from the hearth to a conventional water cooled vertical mold 18 in which it is solidified to form an ingot or electrode for subsequent remelting 20.
  • a coolant such as water.
  • the lid 26 is provided with internal passage 28 such as conduits or jackets through which a coolant such as water is circulated.
  • the condensate coating 25 has a different morphology than that of condensates deposited on surfaces which have not been cooled, the difference in morphology being somewhat analogous to that between snow (corresponding to condensate on conventional condensate screens and uncooled surfaces) and ice (corresponding to the condensate 25 on the water-cooled surfaces 22).
  • the condensate coating 25 is less frangible and less likely to break away and fall into the liquid metal in the hearth.
  • the lid 26 for the furnace has a domed shape providing a concave interior surface facing the hearth. This produces a "hoop" effect which makes the condensate coating self-supporting and decreases any tendency of portions of the condensate on that surface to separate and fall into the hearth.
  • the relatively constant temperature of the surfaces 22 maintained by the coolant circulated through the conduits 28 eliminates thermal cycling of the surfaces, further reducing the likelihood that any of the condensate will separate from those surfaces.
  • a dome shaped insert 32 mounted beneath the dome shaped cover 26 has interior surfaces 34 formed with dovetail-shaped grooves 36 to enhance retention of a layer of condensate 37 on the surfaces 34.
  • Water cooling passages 38 are provided in the insert in the same manner as in the lid 26 of Fig. 1.
  • the insert 32 is preferably positioned between the lid 26 and the hearth 12 and has openings 40 for passage of energy beams 15 from the energy sources 14 to the hearth.
  • the dome-shaped insert 32 may be used with or without dovetail grooves depending on the duration of the refining operation and the specific alloy being refined.
  • dome-shaped cover 26 and the side walls of the enclosures 24 of the embodiment shown in Fig. 1 may be provided with the dovetail retention grooves in the same manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Toxicology (AREA)
  • Plasma & Fusion (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP19980202473 1997-09-04 1998-07-23 Kondensatauffanganordnung für Schmelzbehandlung in Kaltherdofen Expired - Lifetime EP0900854B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US92320197A 1997-09-04 1997-09-04
US923201 1997-09-04

Publications (2)

Publication Number Publication Date
EP0900854A1 true EP0900854A1 (de) 1999-03-10
EP0900854B1 EP0900854B1 (de) 2001-05-30

Family

ID=25448297

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980202473 Expired - Lifetime EP0900854B1 (de) 1997-09-04 1998-07-23 Kondensatauffanganordnung für Schmelzbehandlung in Kaltherdofen

Country Status (3)

Country Link
EP (1) EP0900854B1 (de)
JP (1) JP3076306B2 (de)
DE (1) DE69800856T2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1845325A1 (de) * 2005-01-25 2007-10-17 Toho Titanium Co., Ltd. Vorrichtung zum schmelzen von metall mittels elektronenstrahlen und verfahren zur herstellung hochschmelzender metallgussblöcke mit dieser vorrichtung
US7757748B2 (en) 2005-01-25 2010-07-20 Toho Titanium Co., Ltd. Apparatus for melting metal by electron beams and process for producing high-melting metal ingot using this apparatus
CN113249587A (zh) * 2021-03-22 2021-08-13 洛阳双瑞精铸钛业有限公司 一种用于eb炉熔炼钛合金的组合式冷凝罩
CN113249586A (zh) * 2021-03-22 2021-08-13 洛阳双瑞精铸钛业有限公司 一种用于eb炉熔炼钛合金的双层式冷凝罩

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5066357B2 (ja) * 2006-10-25 2012-11-07 東邦チタニウム株式会社 金属溶製用溶解装置およびこれを用いた金属の溶製方法
JP5046385B2 (ja) * 2007-09-25 2012-10-10 東邦チタニウム株式会社 金属の電子ビーム溶解炉および同炉を用いた金属の溶解方法
AT509787B1 (de) * 2010-04-21 2012-09-15 Inteco Special Melting Technologies Gmbh Wassergekühlter deckel für ein feuerfest zugestelltes behandlungsgefäss für metallschmelzen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3690635A (en) * 1969-05-16 1972-09-12 Air Reduction Condensate collection means
FR2254247A5 (en) * 1973-12-05 1975-07-04 Desmarquest & Cec Spherical electrically heated laboratory furnace - for operation at high temps. under vacuum and under controlled atmospheres
DE3147337A1 (de) * 1981-11-28 1983-06-09 SIDEPAL S.A. Société Industrielle de Participations Luxembourgeoise, Luxembourg Wassergekuehlter, haubenfoermiger deckel
WO1997021965A1 (en) * 1995-12-12 1997-06-19 Essge Systemteknik Ab Lining of furnace

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3690635A (en) * 1969-05-16 1972-09-12 Air Reduction Condensate collection means
FR2254247A5 (en) * 1973-12-05 1975-07-04 Desmarquest & Cec Spherical electrically heated laboratory furnace - for operation at high temps. under vacuum and under controlled atmospheres
DE3147337A1 (de) * 1981-11-28 1983-06-09 SIDEPAL S.A. Société Industrielle de Participations Luxembourgeoise, Luxembourg Wassergekuehlter, haubenfoermiger deckel
WO1997021965A1 (en) * 1995-12-12 1997-06-19 Essge Systemteknik Ab Lining of furnace

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
H.B. BOMBERGER: "The melting of titanium", JOURNAL OF METALS, vol. 36, no. 12, December 1984 (1984-12-01), Warrendale, PA, USA, pages 39 - 47, XP002086633 *
R. BAKISH: "State of the art in electron beam melting and refining", JOM, vol. 43, no. 5, May 1991 (1991-05-01), Warrendale, PA, USA, pages 42 - 44, XP000249802 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1845325A1 (de) * 2005-01-25 2007-10-17 Toho Titanium Co., Ltd. Vorrichtung zum schmelzen von metall mittels elektronenstrahlen und verfahren zur herstellung hochschmelzender metallgussblöcke mit dieser vorrichtung
EP1845325A4 (de) * 2005-01-25 2008-12-24 Toho Titanium Co Ltd Vorrichtung zum schmelzen von metall mittels elektronenstrahlen und verfahren zur herstellung hochschmelzender metallgussblöcke mit dieser vorrichtung
US7757748B2 (en) 2005-01-25 2010-07-20 Toho Titanium Co., Ltd. Apparatus for melting metal by electron beams and process for producing high-melting metal ingot using this apparatus
CN101147037B (zh) * 2005-01-25 2012-07-04 东邦钛株式会社 金属的电子束熔化装置以及采用该装置的高熔点金属锭的制造方法
CN113249587A (zh) * 2021-03-22 2021-08-13 洛阳双瑞精铸钛业有限公司 一种用于eb炉熔炼钛合金的组合式冷凝罩
CN113249586A (zh) * 2021-03-22 2021-08-13 洛阳双瑞精铸钛业有限公司 一种用于eb炉熔炼钛合金的双层式冷凝罩
CN113249587B (zh) * 2021-03-22 2022-10-18 洛阳双瑞精铸钛业有限公司 一种用于eb炉熔炼钛合金的组合式冷凝罩

Also Published As

Publication number Publication date
DE69800856D1 (de) 2001-07-05
JP3076306B2 (ja) 2000-08-14
JPH11132664A (ja) 1999-05-21
EP0900854B1 (de) 2001-05-30
DE69800856T2 (de) 2002-09-12

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